Slope hired a server from a company called Sentry, which stored users' seed phrases in readable text form.
Twitter had similar issues in 2018.
Once may have been accident. Twice seems too often to be a coincidence.
I think its safe to say storing passwords and sensitive information in plaintext has become an unofficial IT industry standard.
Many platforms sell end user meta data for profit. Passwords and other sensitive data could qualify under this heading. The government would probably also support passwords and sensitive data being stored in plaintext to prevent money laundering.